Lath-board.



8. M. FORD. LATH BOARD.

APPLICATION FILED MAR. 21' 1916- 1 ,1 96,768.. Patented Sept. 5, 1916.

SILAS M. FORD, OF ST. PAUL, MINNESOTA.

LATE-BOARD.

lath-board of flexible sheeting, such as waterproofed pap'er, corrugated to form on each side lath shaped projections and similar intermediate depressions or valleys and designed to be fastened to the beams or studding of buildings to serve as a foundation for plaster, the depressions or valleys on the under side of the board forming dead air spaces and the valleys on the outer side thereof forming plaster receiving spaces.

It is the object of the invention to provide improved means for preventing the corrugations from becoming crushed or flattened in handling and use, and also for binding them together so that they will not spread ap'art, with the consequent impairment of their capacity as dead air spaces or plaster receiving spaces.

With these objects in view I have provided strips arranged transversely of the corrugations and secured to the board by means of prongs which extend downwardly through the inclined sides of the projections and into the board portions at the bottom. The projections are preferably of keyed lath shape with inwardly inclined sides, and the strips preferably bridge the valleys between the projections and are Socured upon the faces thereof. In such case the prongs will pierce and extend down through the faces as well as the sides ofthe projections, and into the board portions at the bottoms of the valleys. The prongs are preferably provided with lateral shoulders or arms bearing against the upper faces of the board portions at the bottoms of the valleys so as to form strut like supports for the strips.

More particularly the inventionconsists in the construction, combination, and arrangement of parts hereinafter described and claimed.

In the accompanying drawings forming part of this specification, Figure 1'is a perspective view of a fragment of lath-board embodying the present invention; Fig. 2 is an end view ofthe same; Fig. 3 is an end Specification of Letters Patent.

Patented Sept. 5, 1916.

Application filed March 27, 1916. Serial No. 86,842.

view of a modified form in which the arms or shoulders which impart the strut like characteristics to the prongs are omitted;

Fig. 4 is a perspective View of a modified form wherein the strips instead of extending entirely across the board merely bridge the depressions between the lath projections; and Fig. 5 is a perspective View of a fragment of one of the strips alone.

The lath-board is preferably made of waterproofed paper pressed or molded -.to form corrugations or alternate projections and depressions or valleys of keyed-lath shape, the projections on one side forming the valleys or depressions on the other and vice versa. These keyed lath shaped or plait-like projections are of the shape of a lath having keyed or inwardly inclined sides as shown in the drawings, where 2 represents the lath projections on the outer face of the board, 8. their inwardly inclined sides, and 4 the valleys or depressions between them. These valleys are formed by stamping out the lath projections 5 on the inner face of the board, and there are similar depressions or valleys 6 between the lath projections 4,

these valleys being formed by stamping up the projections 2- The valleys or longitudinal depressions 4 which are open on the outer or plastering face of the board serve as plaster receiving spaces, while the oppositely facing'valleys or depressions 6 under the hollow stamped up lath projections 2 serve as dead air heat insulating and sound deadening spaces. To prevent the corruga-v tions from being crushed or spread apart in versely of the corrugations and preferably secured at intervals upon the face of the handling or use, I have provided strips '7 {preferably of sheet metal arranged transprojections and bridging the depressions or valleys between them. These strips may extend across several or all of the projections shown in Fig. l, or they may extend only from one projection to another, as shown in Fig. 4. The strips are secured to the board by means of prongs 8, which are preferably struck up from, or at least integral with, the strips themselves. Where the projections are of keyed-lath shape, the prongs are forced through the projections near their side edges 3, into the valleys 4 and through the reverse projections 5 at the bottom of these valleys, thus passing through three may be then bent over and clenched against prongs.

the under side of the board portions which form the reverse projections 5-. Passing as they do'through both the tops and the inclined sides of the lath projections 2, and being fast to the board'portions 5 below and braced by the anchoring of the strip in the adjacent projection, the prongs will oifer an:

effectual resistance to any crushing or flattening pressure upon the board, for such pressure would cause the sides of the projections to exert a lateral thrust upon the To secure additional resistance to crushing pressure I prefer to construct the prongs with shoulders 9 in position to bear against the upper faces of the bottom board portions, so as to form strut like supports for the strips, and these shoulders may be provided With lateral arms 10 bent over against the board, as shown in Figs. 1, 2, and 5.

It will be evident that the strips arranged and secured in the manner described will also act as ties to bind the corrugations together and prevent them from being pulled apart as well as braces to prevent them from being pushed together.

I claim: i

1. A lath-board comprising a flexible sheet corrugated to form spaced keyed-lath shaped projections and intermediate valleys, the

projections having inwardly inclined sides,

strips supported at intervals upon the faces of adjacent projections and bridging the valleys between them, and prongs securing said strips to said board, said prongs pier cingand extending down through the faces and inclined sides of the projections near the side edges thereof and through the board portions at the bottoms of the valleys.

2. A lath-board comprising a flexible sheet corrugated to form spaced keyed-lath shaped projections and intermediate valleys, the

projections having inwardly inclined sides, strips supported at intervals upon the faces of adjacent projections and bridging the valleys between them, and prongs securing said strips to said board, said prongs piercing and extending down through the faces and inclined sides of the projections near the side edges thereof and through the board portionsat the bottom of'the valleys, and being formed with lateral shoulders in position to bear against the upper faces of said bottom board portions whereby to form struts between said strips and said board portions.

3. A lath-board comprising a flexible sheet corrugated to form spaced lath projections and intermediate valleys, strips arranged at intervals transversely of the corrugations, and prongs securing said strips to said board, said prongs piercing and extending down through the sides of the projections and into the bottom portions of the board, and being formed with lateral shoulders in position to bear against the upper faces of said bottom board portions, whereby to form struts between said strips and said board portions.

l. A lath-board comprising a flexible sheet corrugated to form spaced'lath projections and intermediate valleys, strips arranged at intervals transversely of the corrugations, and prongs securing said strips to said board, said prongs piercing and extending down through the sides of the projections and into the bottom portions of the board.

In testimony whereof I aflix my signature in presence of two witnesses.

SILAS M. FORD.

WVitnesses:

ARTHUR P. Lo'rnnor, H. Swanson. 

